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Starting from April 2007, a search for solar daily variation of the muonintensity ($E_\mu >0.2$ GeV) at sea level and using two directional muontelescopes is in progress. In this survey, several ground level enhancements(GLEs) on the muon counting rate background have been found. Here, we highlightone of them, observed in the vertical telescope on 07 August 2007 for thefollowing reasons: The GLE consists of a single narrow peak, with a statisticalsignificance of 4.4$\sigma$. The GLE is in temporal coincidence with a SWIFTtrigger $N^0287222$, at 21:16:05 UT according to the Burst Alert Telescope(BAT) on board of the SWIFT spacecraft. However, the Swift StarTracker had loststellar lock minutes before that and the resulting improper s/c attitudeinformation caused BAT to "trigger" on a known source. Even so, the SWIFTtrigger coordinates are inside the effective field of view of the vertical Tupimuon telescope. The temporal and directional coincidences between this GLE andthe SWIFT satellite unknown event strongly suggest that they may be physicallyassociated. Details and implications of this possible association are reportedin this work.

Possible evidence of a ground level enhancement of muons in association with a SWIFT Trigger